Safety storage device for lithium ion battery

Abstract

The invention discloses safe storage equipment for a lithium ion battery, and belongs to the technical field of safe energy storage of the lithium ion battery. The lithium ion battery safe storage device further comprises a liquid cooling plate, the liquid cooling plate covers the battery modules and is connected with the side walls of the bottom plate groove, a gas storage bag is arranged on the upper surface of the liquid cooling plate, flame-retardant gas is stored in the gas storage bag, the gas storage bag is communicated with a plurality of gas pipelines, and the gas pipelines are communicated with the liquid cooling plate. Each gas pipeline penetrates through the liquid cooling plate to be communicated with the interior of one shell and is used for conveying flame-retardant gas to the interior of the shell, meanwhile, the shell is provided with exhaust holes, and the exhaust holes exhaust the flame-retardant gas and take away heat, so that cooling is achieved. The lithium ion battery safe storage equipment can monitor the temperature in the shell in real time, and can perform intelligent cooling when the temperature in the shell exceeds a threshold value, so that the occurrence of thermal runaway caused by the fact that the temperature cannot be reduced in time is avoided, the spreading of the thermal runaway among the modules is inhibited, the battery modules are protected, and the loss is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of safe energy storage of lithium-ion batteries, and in particular to a safe storage device for lithium-ion batteries. Background Art

[0002] As a stable and efficient energy storage medium in electrochemical energy storage, lithium-ion batteries have been widely used in emerging industries such as new energy power generation and new energy electric vehicles. With the popularization of new energy industries in modern society, the demand for electrochemical energy storage has gradually increased, and the use rate of lithium-ion batteries in production and life has gradually increased, becoming one of the current mainstream energy storage methods. However, there is a problem of heat release during the charging and discharging of lithium-ion batteries, so the lithium-ion module-packaging level needs to prevent heat concentration when used.

[0003] The modules in traditional battery packs are densely arranged. When heat concentration occurs, it is very easy for a single module to rupture or even explode, causing rapid heat diffusion, high-temperature gas and jet fire to destroy adjacent module cells and components above the battery pack, further expanding the danger and causing greater losses. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems in the prior art and provide a lithium-ion battery safety storage device that can monitor the temperature inside the shell in real time and intelligently cool down the shell when the temperature inside the shell exceeds a threshold, thereby avoiding the temperature from not being able to be reduced in time and thus causing thermal runaway, inhibiting the spread of thermal runaway between modules, protecting the battery module and reducing losses.

[0005] The present invention provides a lithium-ion battery safety storage device, comprising a bottom plate groove for uniformly storing a plurality of battery modules, wherein the battery module comprises a battery cell arranged in a shell, and further comprising: a liquid cooling plate, wherein the liquid cooling plate covers the top of each battery module and is connected to the side wall of the bottom plate groove, wherein a gas storage bag is arranged on the upper surface of the liquid cooling plate, wherein a flame-retardant gas is stored in the gas storage bag, wherein the gas storage bag is connected to a plurality of gas pipelines, wherein each gas pipeline passes through the liquid cooling plate and is connected to the inside of one of the shells for conveying the flame-retardant gas to the inside of the shell, and wherein an exhaust hole is arranged on the shell, wherein the exhaust hole discharges the flame-retardant gas and takes away the heat to achieve cooling; an electromagnetic valve is arranged on the gas pipeline inside each shell, and a temperature sensor is arranged inside the outer shell of each battery module, wherein when the temperature sensor detects that the temperature inside the shell of the corresponding battery module reaches a threshold temperature, the battery pack master controller controls the corresponding electromagnetic valve to open, until the temperature sensor detects that the temperature inside the shell of the battery module drops below the threshold temperature, and the battery pack master controller controls the electromagnetic valve to close.

[0006] Preferably, each of the shells is provided with an exhaust hole, the exhaust hole is close to the exhaust hole, the exhaust holes are connected to one end of a branch exhaust pipe, the other end of each branch exhaust pipe is provided with a check valve to prevent the flame-retardant gas from flowing back into the shell, the check valve is connected to the main exhaust pipe, an exhaust pump is provided at the end of the main exhaust pipe, the main exhaust pipe is fixedly arranged on the liquid cooling plate, when the solenoid valve is opened, the battery pack master controller controls the exhaust pump to start synchronously, so as to guide the flame-retardant gas in the outer shell of each battery module to the atmosphere through the branch exhaust pipe and the main exhaust pipe, when the solenoid valve is closed, the battery pack master controller controls the exhaust pump to close synchronously.

[0007] Preferably, a gas sensor is provided in the shell, the multiple battery modules are arranged in a matrix in the bottom plate groove, insulation plates are provided on both sides of each row of battery modules, grooves are provided on the bottom plate grooves on both sides of each column of multiple battery modules, a spring is provided in the groove, one end of the spring abuts the bottom surface of the groove, and the other end is connected to an insulation movable plate, the insulation movable plate slides vertically in the slide groove, the slide groove is fixedly set on the groove, an iron core is provided on the insulation movable plate, the iron core is adsorbed and cooperated with an electromagnet, and the electromagnet is set at the notch edge of the groove; at the same time, a folded insulation layer is provided in the groove, and the insulation layer is connected to the spring.

[0008] Preferably, the battery pack master controller is electrically connected to a buzzer, and the buzzer is used to send a prompt sound to the outside world. When the temperature sensor detects that the internal temperature of the battery module shell is less than or equal to a first threshold value, the battery pack master controller controls the temperature sensor to continue detecting; when the temperature sensor detects that the internal temperature of the battery module shell is greater than the first threshold value, the corresponding solenoid valve opens, the gas pipeline releases gas, and the vacuum pump is turned on to take away the heat inside the shell until the temperature sensor detects that the internal temperature of the battery module shell is less than the first threshold value. The battery pack master controller controls the solenoid valve to close, the vacuum pump is turned off, and the buzzer releases a monitoring signal to prompt management personnel to pay attention to the battery status, forming a first-level warning.

[0009] Preferably, when the vacuum pump is turned on, the temperature sensor detects that the internal temperature of the battery module shell is continuously greater than or equal to the first threshold value or the gas sensor detects that the battery cell releases a specific gas, the battery pack master controller controls the corresponding solenoid valve and the vacuum pump to be continuously opened, and controls the corresponding electromagnet to be powered off, so that the iron core and the electromagnet are released from the adsorption state, and the spring pushes the movable plate so that the movable plate is close to the liquid cooling plate, and the spring pulls the insulation layer to unfold, so as to shield the battery module and close the exhaust hole, thereby preventing heat from being transferred to adjacent battery modules; when the temperature sensor detects that the internal temperature of the battery module shell is continuously less than the first threshold value or the gas sensor does not detect that the battery cell releases a specific gas, the battery pack master controller controls the solenoid valve to be closed, the vacuum pump to be closed, and the buzzer to release a monitoring signal to prompt the management personnel to pay attention to the battery status, thereby forming a secondary warning.

[0010] Preferably, after the electromagnet is powered off and the spring pulls the insulation layer to expand, thereby shielding the battery module and closing the exhaust hole, when the temperature sensor detects that the internal temperature of the battery module shell is greater than or equal to the second threshold and continues to rise, the battery pack master controller controls the buzzer to issue an alarm and prompts personnel to evacuate; when the temperature sensor detects that the internal temperature of the battery module shell is less than the second threshold, and the gas sensor detects that the concentration of the specific gas is continuously increasing, indicating that the release rate of the specific gas is continuously increasing, the battery pack master controller controls the buzzer to issue an alarm and prompt personnel to evacuate; when the gas sensor detects that the release rate of the specific gas decreases or remains unchanged, the battery pack master controller controls the buzzer to release a signal to prompt maintenance, forming a three-level warning.

[0011] Preferably, there are multiple battery cells in the battery module, and the battery cell safety valves on the multiple battery cells are all oriented toward the exhaust holes and are all oriented parallel to the plate surface of the liquid cooling plate.

[0012] Preferably, the gas sensor is located above and close to the exhaust hole.

[0013] Preferably, the temperature sensor is fixedly arranged on the battery cell.

[0014] Preferably, the thermal insulation layer corresponds to two springs, the two springs are respectively located on both sides of the thermal insulation layer, and each spring is connected to the thermal insulation layer.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] In the present lithium-ion battery safety storage device, the liquid cooling plate is used to absorb the heat of the battery module, and at the same time, the liquid cooling plate is used to cool the flame-retardant gas, and the heat in the shell is taken away by the cooled flame-retardant gas. The temperature sensor is used to detect the temperature in the shell in real time. When the temperature sensor detects that the internal temperature of the shell of the corresponding battery module reaches the threshold temperature, the battery pack master controller controls the corresponding solenoid valve to open, so that the flame-retardant gas in the gas storage pack enters the shell, takes away the heat in the shell and is discharged from the exhaust hole, so that the temperature sensor detects that the internal temperature of the shell of the battery module drops below the threshold temperature, and the battery pack master controller controls the solenoid valve to close.

[0017] The lithium-ion battery safety storage device solves the problem that when the modules in the traditional battery pack are densely arranged, the single module cell is very likely to rupture or even explode when heat concentration occurs, and avoids the problem of rapid diffusion of heat and high-temperature gas. It can monitor the temperature inside the shell in real time and intelligently cool down the shell when the temperature inside the shell exceeds the threshold, avoiding the temperature from not being able to be lowered in time and causing thermal runaway, inhibiting the spread of thermal runaway between modules, protecting the battery module and reducing losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a flow chart of the present invention;

[0019] Figure 2 is an internal schematic diagram of a battery module of the present invention;

[0020] Figure 3 A diagram showing the position relationship between multiple battery modules and heat insulation plates;

[0021] Figure 4 This is the assembly drawing of the bottom plate groove;

[0022] Figure 5 It is a schematic diagram of the folded state of the thermal insulation layer;

[0023] Figure 6 Schematic diagram of the unfolded state of the thermal insulation layer;

[0024] Figure 7 Schematic diagram of the connection between the thermal insulation layer and the spring.

[0025] Description of reference numerals:

[0026] 1. Battery module, 2. Insulation board, 3. Gas storage bag, 4. Battery cell, 5. Liquid cooling plate, 6. Gas sensor, 7. Exhaust hole, 8. Suction hole, 9. Branch exhaust pipe, 10. Main exhaust pipe, 11. Temperature sensor, 12. Solenoid valve, 13. Insulation layer, 14. Slide, 15. Insulation movable plate, 16. Spring, 17. Iron core. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the present invention belongs. "Include" or "comprises" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Inside", "outside", "upper", "lower", "far", "near", "front", "back", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] The drawings in the present invention are not drawn strictly according to the actual scale, and the specific size and quantity of each structure can be determined according to actual needs. The drawings described in the present invention are only schematic diagrams of the structures.

[0030] The lithium-ion battery safety storage device provided by the present invention comprises a bottom plate slot for uniformly storing a plurality of battery modules 1, wherein the battery module 1 comprises a battery cell 4 arranged in a housing, such as Figure 2 to Figure 6 It also includes: a liquid cooling plate 5, which covers the top of each battery module 1 and is connected to the side wall of the bottom plate groove. A gas storage bag 3 is arranged on the upper surface of the liquid cooling plate 5. Flame-retardant gas is stored in the gas storage bag 3. The gas storage bag 3 is connected to a plurality of gas pipelines. Each gas pipeline passes through the liquid cooling plate 5 and is connected to the inside of one of the shells for conveying flame-retardant gas to the inside of the shell. Meanwhile, an exhaust hole 7 is arranged on the shell, which discharges the flame-retardant gas and takes away heat to achieve cooling. A solenoid valve 12 is arranged on the gas pipeline inside each shell, and a temperature sensor 11 is arranged inside the outer shell of each battery module 1. When the temperature sensor 11 detects that the internal temperature of the shell of the corresponding battery module 1 reaches the threshold temperature, the battery pack master controller controls the corresponding solenoid valve 12 to open until the temperature sensor 11 detects that the internal temperature of the shell of the battery module 1 drops below the threshold temperature, and the battery pack master controller controls the solenoid valve 12 to close.

[0031] In the present lithium-ion battery safety storage device, the liquid cooling plate 5 is used to absorb the heat of the battery module 1, and at the same time, the liquid cooling plate 5 is used to cool the flame-retardant gas, and the heat in the shell is taken away by the cooled flame-retardant gas. The temperature sensor 11 is used to detect the temperature in the shell in real time. When the temperature sensor 11 detects that the internal temperature of the shell of the corresponding battery module 1 reaches the threshold temperature, the battery pack master controller controls the corresponding solenoid valve 12 to open, so that the flame-retardant gas in the gas storage pack 3 enters the shell, takes away the heat in the shell and is discharged from the exhaust hole 7, so that the temperature sensor 11 detects that the internal temperature of the shell of the battery module 1 drops below the threshold temperature, and the battery pack master controller controls the solenoid valve 12 to close.

[0032] This lithium-ion battery safety storage device can monitor the temperature inside the shell in real time, and intelligently cool down the shell when the temperature inside the shell exceeds the threshold, thereby avoiding the occurrence of thermal runaway caused by the temperature not being able to be lowered in time, inhibiting the spread of thermal runaway between modules, protecting the battery module, and reducing losses.

[0033] In this embodiment, Figure 2 to Figure 6 Each of the shells is provided with an exhaust hole 8, which is close to the exhaust hole 7. The exhaust holes 8 are connected to one end of a branch exhaust pipe 9. The other end of each branch exhaust pipe 9 is provided with a check valve to prevent the flame-retardant gas from flowing back into the shell. The check valve is connected to the main exhaust pipe 10. An exhaust pump is provided at the end of the main exhaust pipe 10. The main exhaust pipe 10 is fixedly set on the liquid cooling plate 5. When the solenoid valve 12 is opened, the battery pack master controller controls the exhaust pump to start synchronously to guide the flame-retardant gas in the outer shell of each battery module 1 to the atmosphere through the branch exhaust pipe 9 and the main exhaust pipe 10. When the solenoid valve 12 is closed, the battery pack master controller controls the exhaust pump to close synchronously.

[0034] By turning on the vacuum pump, the gas inside the shell is quickly discharged into the atmosphere, avoiding the problem of untimely gas discharge, speeding up the gas discharge, and at the same time, the battery cell 4 is cooled faster. The check valve is used to prevent the gas between multiple shells from flowing into each other.

[0035] In this embodiment, Figure 2 to Figure 7A gas sensor 6 is provided in the shell, and the multiple battery modules 1 are arranged in a matrix in the bottom plate groove. Insulation plates 2 are provided on both sides of each row of battery modules 1, and grooves are provided on the bottom plate grooves on both sides of each column of multiple battery modules 1. A spring 16 is provided in the groove, one end of the spring 16 abuts against the bottom surface of the groove, and the other end is connected to an insulation movable plate 15. The insulation movable plate 15 slides vertically in the slide groove 14, and the slide groove 14 is fixedly set on the groove. An iron core 17 is provided on the insulation movable plate 15, and the iron core 17 is adsorbed and cooperated with the electromagnet, and the electromagnet is set at the notch edge of the groove; at the same time, a folded insulation layer 13 is provided in the groove, and the insulation layer 13 is connected to the spring 16.

[0036] When the temperature inside the shell exceeds the threshold, the battery pack master controller controls the electromagnet to cut off the power, and the spring 16 is released to unfold the folded insulation layer 13, sealing the battery module 1 with increased temperature and preventing heat from being transferred to the adjacent battery module. The cooling flame-retardant gas is used to diffuse and dilute the high-temperature gas, and the spring 16 drives the insulation layer 13 to unfold, so that the inside of the battery module 1 can be effectively cooled, delaying the thermal runaway process and inhibiting the spread of thermal runaway between modules.

[0037] In this embodiment, Figure 1 to Figure 7 The battery pack master controller is electrically connected to a buzzer, which is used to send a prompt sound to the outside world. The first threshold temperature is set to 60°C. When the temperature sensor 11 detects that the internal temperature of the shell of the battery module 1 is less than or equal to 60°C, the battery pack master controller controls the temperature sensor 11 to continue detecting; when the temperature sensor 11 detects that the internal temperature of the shell of the battery module 1 is greater than 60°C, the corresponding solenoid valve 12 opens, the gas pipeline releases gas, and the vacuum pump is turned on to take away the heat inside the shell until the temperature sensor 11 detects that the internal temperature of the shell of the battery module 1 is less than 60°C. The battery pack master controller controls the solenoid valve 12 to close, the vacuum pump is turned off, and the buzzer releases a monitoring signal to prompt management personnel to pay attention to the battery status, forming a first-level warning.

[0038] In this embodiment, Figure 1After the vacuum pump is turned on, when the temperature sensor 11 detects that the internal temperature of the shell of the battery module 1 is continuously greater than or equal to 60°C or the gas sensor 6 detects that the battery cell 4 releases a specific gas, the battery pack master controller controls the corresponding solenoid valve 12 and the vacuum pump to be continuously opened, and controls the corresponding electromagnet to be powered off, and the iron core 17 and the electromagnet are released from the adsorption state. At this time, the spring 16 pushes the movable plate 15 so that the movable plate 15 is close to the liquid cooling plate 5, and the spring 16 pulls the insulation layer 13 to unfold, so as to shield the battery module 1 and close the exhaust hole 7 to prevent heat from being transferred to the adjacent battery module 1; when the temperature sensor 11 detects that the internal temperature of the shell of the battery module 1 is continuously less than 60°C or the gas sensor 6 does not detect that the battery cell 4 releases a specific gas, the battery pack master controller controls the solenoid valve 12 to be closed, the vacuum pump to be closed, and the buzzer to release a monitoring signal to prompt the management personnel to pay attention to the battery status, forming a secondary warning.

[0039] In this embodiment, Figure 1 The electromagnet is powered off, and the spring 16 pulls the insulation layer 13 to expand, thereby shielding the battery module 1 and closing the exhaust hole 7. When the temperature sensor 11 detects that the internal temperature of the shell of the battery module 1 is greater than or equal to the second threshold and continues to rise, the second threshold is set to 100°C, the battery pack master controller controls the buzzer to issue an alarm and prompts personnel to evacuate; when the temperature sensor 11 detects that the internal temperature of the shell of the battery module 1 is less than 100°C, and the gas sensor 6 monitors that the concentration of the specific gas is constantly increasing, indicating that the release rate of the specific gas is constantly increasing, the battery pack master controller controls the buzzer to issue an alarm and prompt personnel to evacuate; when the gas sensor 6 monitors that the release rate of the specific gas is reduced or unchanged, the battery pack master controller controls the buzzer to release a signal, prompting maintenance, forming a three-level warning.

[0040] The lithium-ion battery safety storage device has a three-level warning function, takes corresponding warning control measures for the battery module 1 in different states, responds promptly to thermal runaway hazards, and has high safety. The lithium-ion battery safety storage device is simple and practical, with a clear path, low material cost, and easy function implementation. It ensures the stability and safety of the battery module and battery pack during operation as a whole, and reduces the losses caused by thermal runaway disasters.

[0041] In this embodiment, Figure 2 and Figure 5 There are multiple battery cells 4 in the battery module 1 , and the battery cell safety valves on the multiple battery cells 4 are all facing the exhaust hole 7 and are all oriented parallel to the plate surface of the liquid cooling plate 5 .

[0042] The lithium-ion battery safety storage device changes the traditional way of placing battery cells, avoiding direct damage to objects or people above the battery pack through thermal runaway high-temperature gas production and jet flames, and is conducive to the rapid discharge of high-temperature gas from the exhaust hole 7 and the suction hole 8, which can protect the safety of battery pack components and users to a greater extent.

[0043] In this embodiment, Figure 5 The gas sensor 6 is located above and close to the exhaust hole 7 .

[0044] In this embodiment, Figure 2 The temperature sensor 11 is fixedly disposed on the battery cell 4 .

[0045] In this embodiment, Figure 7 The heat insulation layer 13 corresponds to two springs 16 , and the two springs 16 are respectively located on both sides of the heat insulation layer 13 , and each spring 16 is connected to the heat insulation layer 13 .

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A lithium-ion battery safety storage device, comprising a bottom plate slot for uniformly storing a plurality of battery modules (1), wherein the battery module (1) comprises a battery cell (4) arranged in a housing, characterized in that: Also includes a liquid cooling plate (5); The liquid cooling plate (5) covers the top of each battery module (1) and is connected to the side wall of the bottom plate groove. A gas storage bag (3) is provided on the upper surface of the liquid cooling plate (5). The gas storage bag (3) stores flame-retardant gas. The gas storage bag (3) is connected to a plurality of gas pipelines. Each gas pipeline passes through the liquid cooling plate (5) and is connected to the inside of one of the shells for conveying flame-retardant gas to the inside of the shell. Meanwhile, an exhaust hole (7) is provided on the shell. The exhaust hole (7) discharges flame-retardant gas and takes away heat to achieve cooling. A solenoid valve (12) is provided on the gas pipeline inside each shell, and a temperature sensor (11) is provided inside the shell of each battery module (1). When the temperature sensor (11) detects that the temperature inside the shell of the corresponding battery module (1) reaches a threshold temperature, the battery pack master controller controls the corresponding solenoid valve (12) to open until the temperature sensor (11) detects that the temperature inside the shell of the battery module (1) drops below the threshold temperature, and the battery pack master controller controls the solenoid valve (12) to close.

2. The lithium-ion battery safety storage device according to claim 1, characterized in that: Each of the shells is provided with an exhaust hole (8), the exhaust hole (8) is close to the exhaust hole (7), the exhaust holes (8) are connected to one end of a branch exhaust pipe (9), the other end of each branch exhaust pipe (9) is provided with a check valve to prevent the flame-retardant gas from flowing back into the shell, the check valve is connected to the main exhaust pipe (10), and an exhaust pump is provided at the end of the main exhaust pipe (10), the main exhaust pipe (10) is fixedly arranged on the liquid cooling plate (5), when the solenoid valve (12) is opened, the battery pack master controller controls the exhaust pump to be opened synchronously, so as to guide the flame-retardant gas in the shell of each battery module (1) to the atmosphere through the branch exhaust pipe (9) and the main exhaust pipe (10), and when the solenoid valve (12) is closed, the battery pack master controller controls the exhaust pump to be closed synchronously.

3. The lithium-ion battery safety storage device according to claim 2, characterized in that: A gas sensor (6) is arranged in the shell, the multiple battery modules (1) are arranged in a matrix in the bottom plate groove, and heat insulation plates (2) are arranged on both sides of each row of battery modules (1), and grooves are arranged on both sides of the bottom plate groove of each column of multiple battery modules (1), and a spring (16) is arranged in the groove, one end of the spring (16) abuts against the bottom surface of the groove, and the other end is connected to a heat insulation movable plate (15), the heat insulation movable plate (15) slides vertically in the slide groove (14), the slide groove (14) is fixedly arranged on the groove, and an iron core (17) is arranged on the heat insulation movable plate (15), the iron core (17) is adsorbed and matched with an electromagnet, and the electromagnet is arranged at the edge of the groove; at the same time, a folded heat insulation layer (13) is arranged in the groove, and the heat insulation layer (13) is connected to the spring (16).

4. The lithium-ion battery safety storage device according to claim 3, characterized in that: The battery pack master controller is electrically connected to a buzzer, and the buzzer is used to send a warning sound to the outside world. When the temperature sensor (11) detects that the temperature inside the shell of the battery module (1) is less than or equal to a first threshold value, the battery pack master controller controls the temperature sensor (11) to continue detection; when the temperature sensor (11) detects that the temperature inside the shell of the battery module (1) is greater than the first threshold value, the corresponding solenoid valve (12) opens, the gas pipeline releases gas, and the vacuum pump is turned on to take away the heat inside the shell until the temperature sensor (11) detects that the temperature inside the shell of the battery module (1) is less than the first threshold value. The battery pack master controller controls the solenoid valve (12) to close, the vacuum pump is turned off, and the buzzer releases a monitoring signal to prompt management personnel to pay attention to the battery status, thereby forming a first-level warning.

5. The lithium-ion battery safety storage device according to claim 4, characterized in that: When the vacuum pump is turned on, the temperature sensor (11) detects that the temperature inside the shell of the battery module (1) is continuously greater than or equal to the first threshold value or the gas sensor (6) detects that the battery cell (4) releases a specific gas, the battery pack master controller controls the corresponding solenoid valve (12) and the vacuum pump to be continuously opened, and controls the corresponding electromagnet to be powered off, so that the iron core (17) and the electromagnet are released from the adsorption state, and at this time the spring (16) pushes the movable plate (15) so that the movable plate (15) is tightly attached to the liquid cooling plate (5), and at the same time the spring (16) ) pulls the heat insulation layer (13) to unfold, thereby shielding the battery module (1) and closing the exhaust hole (7) to prevent heat from being transferred to adjacent battery modules (1); when the temperature sensor (11) detects that the internal temperature of the shell of the battery module (1) is continuously less than the first threshold value or the gas sensor (6) does not detect that the battery cell (4) releases a specific gas, the battery pack master controller controls the solenoid valve (12) to close, the vacuum pump to close, and the buzzer releases a monitoring signal to prompt the management staff to pay attention to the battery status, thereby forming a second-level warning.

6. The lithium-ion battery safety storage device according to claim 5, characterized in that: The electromagnet is powered off, and the spring (16) pulls the heat insulation layer (13) to expand, thereby shielding the battery module (1) and closing the exhaust hole (7). When the temperature sensor (11) detects that the temperature inside the shell of the battery module (1) is greater than or equal to the second threshold and continues to rise, the battery pack master controller controls the buzzer to issue a warning and prompts personnel to evacuate; when the temperature sensor (11) detects that the temperature inside the shell of the battery module (1) is less than the second threshold, and the gas sensor (6) detects that the concentration of the specific gas is constantly rising, indicating that the release rate of the specific gas is constantly rising, the battery pack master controller controls the buzzer to issue a warning and prompts personnel to evacuate; when the gas sensor (6) detects that the release rate of the specific gas is reduced or unchanged, the battery pack master controller controls the buzzer to release a signal to prompt maintenance, forming a three-level warning.

7. The lithium-ion battery safety storage device according to claim 1, characterized in that: The battery module (1) contains a plurality of battery cells (4), and the battery cell safety valves on the plurality of battery cells (4) are all oriented toward the exhaust hole (7) and are all oriented parallel to the plate surface of the liquid cooling plate (5).

8. The lithium-ion battery safety storage device according to claim 3, characterized in that: The gas sensor (6) is located above and close to the exhaust hole (7).

9. The lithium-ion battery safety storage device according to claim 1, characterized in that: The temperature sensor (11) is fixedly arranged on the battery cell (4).

10. The lithium-ion battery safety storage device according to claim 3, characterized in that: The heat insulation layer (13) corresponds to two springs (16), the two springs (16) are respectively located on both sides of the heat insulation layer (13), and each spring (16) is connected to the heat insulation layer (13).

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